Leveling-rod.



W. F. WHITTIER.

LEVELING ROD.

APPLICATION FILED MAY 23. 1912.

LM'AOEQ; PatentedJu1y20, 1915.

WITNESSES v 10 By WILLIAM FRANCIS WHITTIER, on D LAWARE, OHIO.

LEVELING-RQD.

iaaooo.

Application filed May 23, 1912.

To all whom it may concern:

Be it known that I, WILLIAM F. WHIT- TIER, a citizen of-the UnitedStates, and a resident of Delaware, in the county of Delaware and Stateof Ohio, have invented a new and Improved Leveling-Rod, of which thehairs above the bench following is a full, clear, and exact description.

My invention relates to leveling rods, and an object of my invention isto provide a leveling rod by whichan elevation can be read directly onthe same withoutcomputation. The ordinary rod now in general use has ascale marked off into linear units with the zero at the bottom numberedfrom the zero upward. In using the old forms of rods, it is customary toplace the rod on the bench mark with the level in some convenientlocation relative thereto, and sight therethrough at the rod, in whichcase the cross-hairs of the level will bisect-the rod, which readingwill be the elevation of the cross-hairs above the bench mark; then byplacing the rod on the elevation to be obtained and sighting the rod inits'new position, the distance of the elevation below the cross-hairswill be indicated and the true elevationis obtained by sub tracting thedistance from the cross hairs to the elevation from the elevation of thecrosse levation of the bench mark.

This computation takes up some material time, especially where theoperation is repeated several hundreds of times-a day.

I attain the aboveoutlined object by means of a rod resembling inconstruction rods now used in the art except that the linear scale ismovable and numbered successively in increasing order downward from anypoint on the scale.

Reference is to .be had to the accompanying drawings forming a part ofthis specification, in which .similar characters of reference indicatecorresponding parts in all the figures, and in which- Figure 1 is adiagrammatic representation of my scale in position on a bench mark andelevation, with a conventional form of'level therebetween; Fig, 2 is avertical sectional 1 I Specification of Letters Patent.

and progressively marked on the scale nor .mark plus the given digit ofthe cated to move,

Patented July 2o, 1915. Serial No. 699,130.

any suitable length, provided with recesses .6, 6 on opposite sides of,one face thereof, adapted to recelve an'endle'ss tape 7 which tape 1smounted upon rollers 8 and 9 suitably journaled, respectively, adjacentthe top and bottom of the rod, which tape is adapted to be held inposition by any suitable means of brake 10. This tape has a scalethereon marked ofl' into linear units, which are numbered in succeedingorder downward from any point on the scale. In the drawings, this tapeis represented as being twenty. feet long, so that ten feet divided intotenths always show on the face of the rod, but my invention does notdepend upon any particular units of length, nor does it in any waydepend upon the number of units the length of the numbered progressivelydownward, and th the modification shown in Fig. 4:, in which the bodyportion 11 has a sliding scale 12 positioned in the front face thereof,which front face may also carry a vernier scale 13, if desired; in thatcase, but a small portion of the scale is shown.

In use, the rod is set on a bench mark 14 having a known elevation abovesea level,

say 821.0 feet and a level 15 is disposed in 'a convenient positionrelative thereto; then sighting through the level'the scale on the rodis moved until the mark numbered 1.0 feet is on a line with thecross':hairs and the scale is locked in that position. It is understoodthat this reading in this case must have the prefix 82, making it 821.0feet. In other words, the tape is rotated until the last numberindicating the elevation of the bench mark is in alinement with thehairs in thelevel, then the locked rod, is placed on the elevation, asshown at 16, and the number on the rod in alinement with the hairs inthe level suifixed to the constant as in this case 82, ives the trueelevation desired, which in the illustration is 822.8 as the 2.8 is inalinement with the hairs of the level 15.

Having thus described my invention, T

vclaim as new and desire to secure by Letters Patent:

1. A levelin rod comprising a support, an endless sca e mounted'on saidsupport, rollers over which said endless scale is loa pivotally mountedlever is may take the form of it is to be understood that having anarc-shaped portion, said pivot linear units, said units being numberedsucally mounted-lever being at one end of the cessively in an increasingorder downwardly 5 support and adjacent one of said rollers, and fromany point of the tape, and a pivoted a spring pressing against. saidlever for and spring-pressed locking member for the causing saidarc-shaped portion to normally tape, arranged adjacent one of therollers press part of said scale, on said last menand pressing said tapeagainst the roller.

' tioned roller for locking the scale against In testimony whereof Ihave signed my 20 movement. name to this specification in the presenceof 2. Aleveling rod, comprising a support two subscribing Witnesses. Ihaving recesses in opposing faces, rollers WILLIAM FRANCIS W'HITTIER.mounted at the upper and lower ends of the rWitnesses: support, animperforate endless tape pass F. C. HIGLEY,

' ing around said rollers and marked off into W. F. WALKER?

